Chemistry
Which Middle Eastern country was widely accused of using chemical weapons in 2013?
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What allotrope of oxygen helps protect the biosphere from solar ultraviolet radiation?
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What group of elements include lithium, sodium, potassium, rubidium, cesium, and francium?
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Triphenylphosphine can be used to prepare which of the following?
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What is often used in advertising signs and produces a bright reddish-orange light?
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What precious metal is most commonly used in catalytic converters for cars?
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